How can a mixture of molecules be separated from one another? Laboratories rely on gel electrophoresis to separate a wide variety of samples, from DNA used in forensics and for mapping genes, to proteins useful in determining evolutionary relationships.
Humans are born with five basic senses—hearing, sight, smell, taste and touch. Perform tests to determine the acuity of each of these senses.
Infections and parasitic diseases may be spread from person to person through air, water, and physical contact. Show students how easily germs can spread and emphasize the importance of good hygiene using fluorescent lotion.
Bacteria can be classified according to the results of a procedure known as a Gram stain. The Gram staining technique requires relatively few reagents and can be successfully practiced with a few simple steps.
The process of DNA extraction is of primary importance in many fields of biotechnology. It is critical for genetic research, DNA fingerprinting, and creating recombinant organisms to produce beneficial products in the field of medicine.
Stare at an object straight ahead. Can you see anything else out of the “corner of your eye”? Seeing beyond the center of our visual field is known as peripheral vision. Explore the range of your own peripheral vision.
Cell membranes help hold cell contents within the confines of the cell. If a cell membrane is damaged physically or chemically, the contents of the cell can “leak” out. In this activity, students can observe the red pigment (betacyanin) after it has left beet cells that have been damaged to varying degrees.
What features distinguish living from non-living things? This demonstration is designed to challenge and provoke students to think about the definition of life. Observe the properties of organisms that a lifeless system can imitate.
Ever bite into an apple and hit a brown spot? What causes apples, potatoes, pears, and other foods to turn brown? Can it be prevented?
Diffusion of water into and out of cells is often demonstrated by treating cells with various concentrations of solutions and then examining them under a microscope. This activity allows students to view changes caused by osmotic pressure using a giant "cell" (chicken egg).
Use this activity to provoke discussion of an important social and health issue. Designed to simulate the transmission of a virus, the activity is based on a color change in a simple chemical reaction.
The membrane of a living cell plays a vital role in regulating what goes into and out of the cell. Some characteristics of cell membranes are discovered in this exercise.
Cells from the lining of the mouth provide an easy source of eukaryotic cells for observation. Plus, cheek cells are a great way to connect textbook drawings and models to life.
How do cell membranes regulate the internal composition of the cell? Use dialysis tubing to teach students the fundamental concepts of diffusion.
Demonstrate yeast respiration—and simulate the effects of chemical pollution.
Five major water quality factors: Basic tests at minimal expense for students at all levels.
Easy, economical way to discover what the first visible traits of tiny sprouts reveal
How to maximize the performance and lifespan of your dissection instruments.
This is a great demonstration to teach concepts of acids and bases, solubility, digestion, and “antacid-testing” consumer biochemistry.
Inexpensive experiment helps students explore the variables affecting protein digestion.
Simulation of predator and prey interaction
One of the basic tenets of cell theory is that “all cells only arise from pre-existing cells.” In fact, new cells are formed by the process of cell division, which gives two genetically identical daughter cells.
Discover the appearance and organizations of plant cells in different phases of the cell cycle.
Explore the effects of mutations: How does a change in one nucleotide affect the way a message is transcribed to RNA and translated to a protein?
A variety of factors may cause gene expression to start or stop. What effect does temperature have?
How does the architecture of a leaf affect its photosynthetic efficiency?
Microscope observations and some simple calculations reveal a lot about root tip growth
In this engaging simulation of electrophoresis, each student in your class becomes a nucleotide in a giant DNA model
Safe, non-invasive method to estimate the amount of the enzyme amylase in saliva.